C++ (Cpp) fuse_d_add_directory示例

示例#1

文件： dir.c 项目： ANFS/ANFS-kernel

static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
				  struct nameidata *nd)
{
	int err;
	struct fuse_entry_out outarg;
	struct inode *inode;
	struct dentry *newent;
	struct fuse_conn *fc = get_fuse_conn(dir);
	bool outarg_valid = true;

	err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
			       &outarg, &inode);
	if (err == -ENOENT) {
		outarg_valid = false;
		err = 0;
	}
	if (err)
		goto out_err;

	err = -EIO;
	if (inode && get_node_id(inode) == FUSE_ROOT_ID)
		goto out_iput;

	if (inode && S_ISDIR(inode->i_mode)) {
		mutex_lock(&fc->inst_mutex);
		newent = fuse_d_add_directory(entry, inode);
		mutex_unlock(&fc->inst_mutex);
		err = PTR_ERR(newent);
		if (IS_ERR(newent))
			goto out_iput;
	} else {
		newent = d_splice_alias(inode, entry);
	}

	entry = newent ? newent : entry;
	if (outarg_valid)
		fuse_change_entry_timeout(entry, &outarg);
	else
		fuse_invalidate_entry_cache(entry);

	return newent;

 out_iput:
	iput(inode);
 out_err:
	return ERR_PTR(err);
}

示例#2

static struct dentry *fuse_lookup(struct _inode *dir, struct dentry *entry,
				  struct nameidata *nd)
{
	int err;
	struct fuse_entry_out outarg;
	struct inode *inode = NULL;
	struct _inode *_inode = NULL;
	struct fuse_conn *fc = get_fuse_conn(dir);
	struct fuse_req *req;
	struct fuse_req *forget_req;

	if (entry->d_name.len > FUSE_NAME_MAX)
		return ERR_PTR(-ENAMETOOLONG);

	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return ERR_PTR(PTR_ERR(req));

	forget_req = fuse_get_req(fc);
	if (IS_ERR(forget_req)) {
		fuse_put_request(fc, req);
		return ERR_PTR(PTR_ERR(forget_req));
	}

	fuse_lookup_init(req, dir, entry, &outarg);
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	/* Zero nodeid is same as -ENOENT, but with valid timeout */
	if (!err && outarg.nodeid &&
	    (invalid_nodeid(outarg.nodeid) ||
	     !fuse_valid_type(outarg.attr.mode)))
		err = -EIO;
	if (!err && outarg.nodeid) {
		inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
				  &outarg.attr);
		if (!inode) {
			fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
			return ERR_PTR(-ENOMEM);
		}
	}
	fuse_put_request(fc, forget_req);
	if (err && err != -ENOENT)
		return ERR_PTR(err);

	_inode = tx_cache_get_inode(inode);
	if (inode && S_ISDIR(_inode->i_mode)) {
		mutex_lock(&fc->inst_mutex);
		err = fuse_d_add_directory(entry, _inode);
		mutex_unlock(&fc->inst_mutex);
		if (err) {
			iput(inode);
			return ERR_PTR(err);
		}
	} else
		d_add(entry, _inode);

	entry->d_op = &fuse_dentry_operations;
	if (!err)
		fuse_change_timeout(entry, &outarg);
	else
		fuse_invalidate_entry_cache(entry);
	return NULL;
}